lossyWAV 1.3.0 Delphi to C++ Translation Thread, Added noise linear PCM bitdepth reduction method. Options

[Nick.C]

And he's off!

Tycho has kindly started the translation of lossyWAV from Delphi to C++.

I'll need to learn it to be able to contribute meaningfully....

Changelog:

lossyWAV beta 1.3.0m 25/03/2013

• experimental parameter --feedback introduced to modify bit removal process to include an added noise check. Seems to work well in conjunction with "--maxclips 0" or "--maxclips 1" at lower quality settings.

lossyWAV beta 1.3.0m 25/03/2013

• Removed experimental new parameter --noisebtr.
• --interp-curve reinstated.
• experimental parameter --altfilter introduced to modify adaptive noise shaping method.

lossyWAV beta 1.3.0k3 08/03/2013

• Introduction of experimental new parameter --noisebtr which applies a new method of detemining bits to remove. Well, I say new - SebastianG did point me in this direction *quite* some time ago. Basically, the creation of the noise shaping filter for each channel outputs a numerical value that I have finally used to determine the number of bits to remove from that codec-block channel. It even works on (non-clipping) tonal samples. It should be noted that this is a complete departure from the original method - no searching for the lowest signal in the FFT output bins. Limited tuning so far - however the presets should give approximately the same resultant FLAC output bitrate from --portable up to --insane. Below --portable, I have made the quality settings more aggressive and --extraportable results in a FLAC output bitrate of approximately 283kbit/s. This is quite a drop from the 308 to 311kbit/s previously. If anyone is prepared to spend the time on some testing, that would be very much appreciated. I think that --extraportable is a bit *too* aggressive at the moment, but that is more of a feeling than anything else.
• --interp-curve removed at this time.
• beta 1.3.0k2 issued due to omission of --noisebtr from text output parameter list (used in FACT chunk and log file).
• beta 1.3.0k3 issued due to last minute fix for bits-per-sample not equal to 16.

lossyWAV beta 1.3.0j 08/02/2013

• Further experimental modification to the adaptive noise shaping routine, backed off a little but now works well with >96kHz samplerate

lossyWAV beta 1.3.0i 30/01/2013

• Further experimental modification to the adaptive noise shaping routine. NB: Testing has shown that this does not work well with >96kHz samplerate!!.
• Bug-fix: now processes >16-bit properly - unexpected integer overflow discovered where floating point was thought to be used.

lossyWAV beta 1.3.0h 23/01/2013

• Further experimental modification to the adaptive noise shaping routine. FLAC encode (-5 -b 512) from "-q X -i" results in 302kbit/s (compared to 309 kbit/s for vanilla --extraportable).

lossyWAV beta 1.3.0g 18/01/2013

• Experimental modification to the adaptive noise shaping routine, new parameter -i, --interp-curve; adds optional cubic curve interpolation in lieu of linear interpolation when determining target spectral shape for each noise shaping filter. When encoded in FLAC (-5 -b 512) using the --extraportable preset, my 10 album test set results in 304kbit/s (compared to 309 kbit/s for vanilla --extraportable).

lossyWAV beta 1.3.0f 26/10/2012

• First attempt at FFMPEG compatibility;

lossyWAV beta 1.3.0e 24/09/2012

• More rounding issues found and amended;
• Output is hopefully bit identical with reference output (2nd attempt....);

lossyWAV beta 1.3.0d 18/09/2012

• Bit removal chain error identified: C++ inherently rounds 0.5 differently from Delphi, Delphi uses Banker's rounding (round to even);
• Banker's rounding implemented;
• Output is now bit identical with reference output (caveat: from testing so far). [edit] Found not to be at --portable. Bug hunting continues.... [/edit]

lossyWAV beta 1.3.0c 15/09/2012

• Piped I/O implemented - please report problems;
• Most bugs in bit-removal chain removed - output not yet bit identical;
• Internal FFT routines optimised.

This post has been edited by Nick.C: Mar 30 2013, 15:37

Attached File(s)

 lossyWAV_beta_1.3.0n.zip ( 337K ) Number of downloads: 62

 

[Nick.C]

I did a bit of testing with my 55 problem sample set (12:43.933 of audio) processed using "-q X" and got the following results:

CODE

+------------------+---------------------+
| FLAC | Relative |
| Encoder +----------+----------+
| Setting | Size | Time |
+------------------+----------+----------+
| -8 -m -r 8 -p | 97.66% | 2187% |
| -8 -r 8 -p | 97.66% | 2089% |
| -8 -e -r 8 -p | 97.66% | 2094% |
| -8 -e -m -r 8 -p | 97.66% | 2105% |
| -8 -e -p | 97.66% | 1599% |
| -8 -p | 97.66% | 1615% |
| -8 -m -p | 97.66% | 1616% |
| -8 -e -m -p | 97.66% | 1634% |
| -6 -e -m -r 8 -p | 98.06% | 1689% |
| -7 -e -r 8 -p | 98.06% | 1694% |
| -6 -e -r 8 -p | 98.06% | 1695% |
| -7 -e -m -r 8 -p | 98.06% | 1697% |
| -4 -e -m -r 8 -p | 98.06% | 1701% |
| -7 -r 8 -p | 98.06% | 1705% |
| -7 -m -r 8 -p | 98.06% | 1710% |
| -5 -e -m -r 8 -p | 98.06% | 1723% |
| -5 -e -r 8 -p | 98.06% | 1799% |
| -7 -e -p | 98.06% | 1215% |
| -6 -e -p | 98.06% | 1220% |
| -6 -e -m -p | 98.06% | 1222% |
| -7 -m -p | 98.06% | 1222% |
| -7 -e -m -p | 98.06% | 1224% |
| -7 -p | 98.06% | 1225% |
| -5 -e -p | 98.10% | 983% |
| -5 -e -m -p | 98.10% | 1020% |
| -4 -e -m -p | 98.18% | 825% |
| -8 -r 8 | 98.36% | 368% |
| -8 -m -r 8 | 98.36% | 370% |
| -8 -e -m -r 8 | 98.36% | 374% |
| -8 -e -r 8 | 98.36% | 379% |
| -8 -e -m | 98.36% | 249% |
| -8 -m | 98.36% | 249% |
| -8 | 98.36% | 250% |
| -8 -e | 98.36% | 250% |
| -3 -e -m -r 8 -p | 98.69% | 1449% |
| -6 -e -m -r 8 | 98.80% | 294% |
| -7 -e -r 8 | 98.80% | 295% |
| -7 -r 8 | 98.80% | 295% |
| -5 -e -r 8 | 98.80% | 296% |
| -7 -e -m -r 8 | 98.80% | 296% |
| -6 -e -r 8 | 98.80% | 296% |
| -4 -e -m -r 8 | 98.80% | 298% |
| -7 -m -r 8 | 98.80% | 298% |
| -5 -e -m -r 8 | 98.80% | 318% |
| -6 -e -m | 98.81% | 174% |
| -7 -e -m | 98.81% | 175% |
| -6 -e | 98.81% | 176% |
| -7 -m | 98.81% | 177% |
| -7 -e | 98.81% | 183% |
| -7 | 98.81% | 189% |
| -3 -e -m -p | 98.82% | 605% |
| -5 -e | 98.86% | 127% |
| -5 -e -m | 98.86% | 138% |
| -4 -e -m | 98.95% | 105% |
| -3 -e -m -r 8 | 99.40% | 261% |
| -6 -m -r 8 -p | 99.42% | 201% |
| -6 -r 8 -p | 99.42% | 205% |
| -5 -r 8 -p | 99.42% | 206% |
| -5 -m -r 8 -p | 99.42% | 209% |
| -4 -m -r 8 -p | 99.42% | 215% |
| -6 -m -p | 99.42% | 137% |
| -6 -p | 99.42% | 138% |
| -5 -m -p | 99.45% | 106% |
| -5 -p | 99.45% | 108% |
| -4 -m -p | 99.51% | 87% |
| -3 -e -m | 99.55% | 71% |
| -3 -m -r 8 -p | 99.86% | 209% |
| -3 -m -p | 99.95% | 88% |
| -6 -m -r 8 | 99.97% | 28% |
| -6 -r 8 | 99.97% | 31% |
| -5 -m -r 8 | 99.97% | 32% |
| -4 -m -r 8 | 99.97% | 33% |
| -5 -r 8 | 99.97% | 33% |
| -6 -m | 99.97% | 6% |
| -6 | 99.97% | 7% |
| -5 -m | 100.00% | -1% |
+------------------+----------+----------+
| -5 | 100.00% | 0% |
+------------------+----------+----------+
| -4 -m | 100.06% | -5% |
| -3 -m -r 8 | 100.44% | 27% |
| -3 -m | 100.52% | -9% |
| -3 -e -r 8 -p | 100.54% | 678% |
| -3 -e -p | 100.69% | 279% |
| -3 -e -r 8 | 101.28% | 102% |
| -3 -e | 101.45% | 9% |
| -3 -r 8 -p | 101.76% | 78% |
| -3 -p | 101.87% | 20% |
| -3 -r 8 | 102.37% | -15% |
| -3 | 102.48% | -30% |
| -4 -e -r 8 -p | 102.59% | 846% |
| -4 -e -p | 102.74% | 403% |
| -4 -e -r 8 | 103.33% | 130% |
| -4 -e | 103.50% | 28% |
| -4 -r 8 -p | 104.08% | 85% |
| -4 -p | 104.19% | 22% |
| -4 -r 8 | 104.64% | -8% |
| -4 | 104.76% | -28% |
| -2 -e -m -r 8 -p | 108.34% | 113% |
| 0 -e -m -r 8 -p | 108.34% | 114% |
| 0 -e -m -r 8 | 108.34% | 114% |
| -2 -e -m -r 8 | 108.34% | 115% |
| -1 -e -m -r 8 | 108.34% | 115% |
| -1 -e -m -r 8 -p | 108.34% | 117% |
| -2 -e -r 8 -p | 108.34% | 118% |
| -2 -e -r 8 | 108.34% | 119% |
| -2 -r 8 | 108.50% | -4% |
| 0 -m -r 8 -p | 108.50% | -3% |
| 0 -m -r 8 | 108.50% | -3% |
| -1 -m -r 8 -p | 108.50% | -2% |
| -2 -r 8 -p | 108.50% | -1% |
| -2 -m -r 8 | 108.50% | -1% |
| -1 -m -r 8 | 108.50% | 0% |
| -2 -m -r 8 -p | 108.50% | 5% |
| -2 -e -m -p | 108.65% | -2% |
| -2 -e -m | 108.65% | -1% |
| -1 -e -m -p | 108.65% | -1% |
| 0 -e -m -p | 108.65% | -1% |
| 0 -e -m | 108.65% | -1% |
| -1 -e -m | 108.65% | 2% |
| -2 -e -p | 108.65% | 5% |
| -2 -e | 108.65% | 7% |
| 0 -m | 108.71% | -28% |
| 0 -m -p | 108.71% | -28% |
| -1 -m | 108.71% | -27% |
| -2 -m -p | 108.71% | -27% |
| -2 | 108.71% | -27% |
| -2 -m | 108.71% | -25% |
| -2 -p | 108.71% | -23% |
| -1 -m -p | 108.71% | -21% |
| 0 -e -r 8 -p | 110.94% | 30% |
| 0 -e -r 8 | 110.94% | 35% |
| 0 -r 8 -p | 111.12% | -31% |
| 0 -r 8 | 111.12% | -28% |
| 0 -e | 111.29% | -29% |
| 0 -e -p | 111.29% | -25% |
| 0 -p | 111.37% | -41% |
| 0 | 111.37% | -34% |
| -1 -e -r 8 -p | 113.83% | 34% |
| -1 -e -r 8 | 113.83% | 44% |
| -1 -r 8 -p | 114.06% | -27% |
| -1 -r 8 | 114.06% | -24% |
| -1 -e -p | 114.18% | -20% |
| -1 -e | 114.18% | -19% |
| -1 -p | 114.31% | -39% |
| -1 | 114.31% | -38% |
+------------------+----------+----------+

This post has been edited by Nick.C: Jan 23 2013, 22:20